aw/go-resize
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Return input image if output dimensions equal input dimensions.

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This commit is contained in:
jst 2014-12-17 11:10:53 +01:00
parent 7e2ce0a2ea
commit 9485f5475a
2 changed files with 21 additions and 0 deletions
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6
resize.go
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@ -86,6 +86,12 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
if height == 0 { if height == 0 {
height = uint(0.7 + float64(img.Bounds().Dy())/scaleY) height = uint(0.7 + float64(img.Bounds().Dy())/scaleY)
} }
// Trivial case: return input image
if int(width) == img.Bounds().Dx() && int(height) == img.Bounds().Dy() {
return img
}
if interp == NearestNeighbor { if interp == NearestNeighbor {
return resizeNearest(width, height, scaleX, scaleY, img, interp) return resizeNearest(width, height, scaleX, scaleY, img, interp)
} }

15
resize_test.go
View File

@ -70,6 +70,21 @@ func Test_Bounds(t *testing.T) {
out.At(0, 0) out.At(0, 0)
} }
func Test_SameSizeReturnsOriginal(t *testing.T) {
img := image.NewRGBA(image.Rect(0, 0, 10, 10))
out := Resize(0, 0, img, Lanczos2)
if img != out {
t.Fail()
}
out = Resize(10, 10, img, Lanczos2)
if img != out {
t.Fail()
}
}
func Benchmark_BigResizeLanczos3(b *testing.B) { func Benchmark_BigResizeLanczos3(b *testing.B) {
var m image.Image var m image.Image
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {